Spyware Blaster loads but won't run

On a client's system that has had ongoing problems with CoolwebSearchX we can load Spyware Blaster but get an error when running the program. Error says we have either a disk sector error or a virus. Everything checks Ok with Scandisk and A/V. Have downloaded to a different location and install still runs clean but we get the same error running every time. Spywareblaster is 3.1 and system is W98SE with current updates.
Thanks for any help, Ken